91 



Genus— STERCORARIUS.— Centre pair of rectrices project 3 in. 



662. S. crepidatllS, Banks (Lestris richardsoni), Richardson Skua. 



Light Form.— Breast, chin, and hind-neck dull white ; forehead, 

 crown, and abdomen brown. 



Dark Form — Washed with sooty throughout ; neck pale yellow. 



Total length, 20 in ; culmen, 1*5 in. ; wing, 13 in. ; tail, central 

 pair 8 in. (5 in. without central) ; tarsus, l*f in. ; middle toe with 

 claw, 1 "7 in. 



Hab. : 4, 5, 6. 



663. S. poiliatorllilllis. Brisson, Pomarine Skua 



Wing over 14 in. ; central rectrices broad, rounded at the ends, 

 projecting 4 in. in the adult, and twisted vertically. 

 Hab. : 1, 2 (winter) ; Siberia in summer. 



ORDER— TUBIN ARES. 



External nostrils are produced into tubes. Palate schizognathous. Nasals 

 holorhinal. Anterior toes are fully webbed ; hallux small or absent 



FAMILY— PROCELLARIID^. 



Nostrils united exteriorly above culmen. Second primary the longest. 



Sub-family — Oceanitin^:. 



Tarsus twice as long as femur. 



Genus — OCEANITES — Basal phalanx of middle toe not much flattened, 

 less than the remaining joints and claw ; claws sharp, spatulate ; 

 scutellre of front of tarsus obsolete. 



664. O. OCeailiclIS, Kuhl. (Thalassidroma wilsoni, Aucl.), Yellow- 



webbed Storm -Petrel (Wilson Storm- Petrel). 



Adult. — Sooty black, forehead and under surface rather paler ; 

 greater wing coverts greyish ; upper tail coverts white ; under wing 

 coverts sooty ; tail black ; shafts of lateral rectrices towards base, 

 and the portion of inner web adjoining, white ; bill and legs black. 



Total length, 6 '8 in. ; bill, 0'7 in. ; wing, 6*1 in. ; tail, side 27 in., 

 centre 2 5 in. • tarsus, 1'4 in. ; middle toe, IT in. 

 Hab. : 3, 4, 5. 6, 9. 



Genus— GARRODIA. — Basal phalanx of middle toe not much flattened, 

 less than the remaining joints and claw ; claws sharp, spatulate ; 

 scutella; of front of tarsus distinct 



665. Cr. nereis, Gld. (Procellaria nereis, Bparte. ; Thalassidroma nereis, 



Old. ), Grey-backed Storm-Petrel. 



Head, neck, and chest sooty-grey ; abdomen white ; rump and 

 edges of wing coverts grey. 



Total length, 6 7 in. ; bill, 0*6 in. ; wing, 5*2 in. ; tail 2*7 in. ; 

 tarsus, 1 2 in. ; middle toe, 1 *2 in. 

 Hab. : 3, 4, 5, 6, 9. 



Genus — PELAGODROMA. — Basal phalanx of middle toe not much 

 flattened, less than remaining joints and claw ; claws flattened and 

 wide. 



666. P. marina. Lath. (Procellaria fregata, Linn. ; Thalassidroma 



marina, Less.), White-faced Storm-Petrel. 



Face and under surface pure white ; behind the eye a line of 

 slate ; under surface grey and brown. 



Total length, 8 in. ; bill, 0*9 in. ; wing, 5 '8 in. ; tail, centre 

 275 in., lateral 3T in. ; tarsus, 1 '6 in. ; middle and outer toe, 1 "3 in. 

 Hab. : 4, 5, 6, 9. 



